A plurality of sub-antennas in a two-dimensional plane antenna 11 or the like receive milliwaves from concerned object 20. An A/D converter 12 converts the received signal to digital data. A signal processor 13 executes signal processing on the digital data for displaying images on a monitor 15. Prior to the measurement, a calibration signal source 14 generates a calibration signal. A phase compensator 133 in the signal processor 13 obtains phase compensation data, and compensates measurement data.
Legal claims defining the scope of protection, as filed with the USPTO.
1. Radar system for displaying images of a concerned object on a monitor or the like by receiving milliwaves emitted from the concerned object comprising: a calibration signal source for generating milliwave calibration signal signals during a calibration period; a transmitter for transmitting said milliwave calibration signals during said calibration period; a receiving antenna having an effectively two-dimensional receiving antenna function, said receiving antenna receiving said calibration signals during said calibration period and passively receiving milliwave received signals; and a signal processor for compensation a processing said passively received milliwave received signals from the concerned object, said compensating processing based on the calibration signals received by the receiving antenna during said calibration period.
2. The radar system according to claim 1 , wherein the compensation processing in the signal processor executes phase compensation based on a phase relation between the passively received milliwave received signals from the concerned object and the calibration signals.
3. The radar system according to claim 1 , wherein the receiving antenna is a two-dimensional plane antenna having a plurality of sub-antennas.
4. The radar system according to claim 1 , wherein the receiving antenna comprises two mobile receiving antennas movable in different directions.
5. The radar system according to claim 3 , which further comprises an analog-to-digital converter for converting signals received form the sub-antennas of the effectively two-dimensional receiving antenna in the receiving antenna to digital data, the signal processor including a correlator for obtaining correlations of the digital data and a two-dimensional FFT for executing Fourier transform of the correlations.
6. The radar system according to claim 1 , wherein the calibration signals have a relatively high intensity level compared to said passively receiving milliwave received signals from the concerned object so that the passively receiving a milliwave received signals are negligible compared to said calibration signals.
7. The radar system according to claim 1 , wherein the concerned object comprises a person's body.
8. A method of obtaining images of a target object in a radar apparatus having a plurality of antennas by obtaining image data thereof by receiving milliwaves emitted therefrom, comprising the steps of: calibrating said radar apparatus by: transmitting milliwave calibration signals to said target object during a calibration period; receiving calibration signals reflected from said target object and processing same for obtaining correlation data of said plurality of antennas; imaging said target object by: passively receiving milliwave signals from the target object from said plurality of antennas; and compensating processing said passively received milliwave signals based on said received calibration signals thereby obtaining image data of the target object.
9. The radar system according to claim 8 , wherein the compensation processing executes phase compensation based on a phase relation between the passively received milliwave signals target object and the received calibration signals.
10. The radar system according to claim 8 , wherein the received calibration signals have relatively high intensity level compared to said passively received milliwave signals from the target so that the passively receiving a milliwave received signals are negligible compared to said calibration signals.
11. The radar system according to claim 8 , wherein the target object comprises a person's body.
12. A control method comprising the steps of: compensation processing a passively received milliwave signal emitted from a target object and received by a receiving antenna, said receiving antenna effectively having a two-dimensional receiving antenna function, said compensation processing including a phase compensation based on a phase relationship between a predetermined milliwave calibration signal transmitted to said target object and received from the target object at the time of calibration and said passively received milliwave signal, thereby obtaining image data of the target object; and executing predetermined control according to the obtained image data.
13. The radar system according to one of claim 12 , wherein the calibration signal has a sufficiently high intensity level compared to said passively received milliwave signal from the target so that the passively receiving a milliwave signal is negligible compared to said calibration signal.
14. The radar system according to claim 12 , wherein the target object comprises a person's body.
15. A method for monitoring a target object using milliwaves, comprising the steps of: receiving a milliwave signal from the target object by utilizing a receiving antenna; compensation processing the received milliwave signal, said compensation processing including a phase compensation based on a phase relationship between milliwave calibration signal received by the receiving antenna and said received milliwave signal to obtain image data of the concerned object, monitoring the target object based on the obtained image data.
16. The radar system according to claim 15 , wherein the calibration signal has a relatively high intensity level compared to said received milliwave signal from the target object so that the received milliwave signals is negligible compared to said calibration signal.
17. The radar system according to claim 15 , wherein the target object comprises a person's body.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 10, 2002
July 13, 2004
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